newb help 16F628 - keypad

[Jekyll]

Hi I am doing my first microcontroller project. I am trying to hook up a keypad that trigers an output when I certain code sequence is entered.

I have been struggling with this for a little while so I'm fairly frustrated. Anyway here's what I have:

PIC-PG2 programmer from sparkfun.
16F628 microcontroller.
4x3 keypad.
WinPIC software [I also have icprog].

I hooked up the icsp and am finally succesfully using it. Anway the problem I'm having is that I'm trying to scan inputs on port A to see which button has been pressed. For some reason I can see inputs on RA6 and RA7 but zilch on RA1 and RA0!!

Attached is my C code which I developed in mikroC. Where am I going wrong here?

BTW when I press the buttons I am seeing the input pins go high w/ my multimeter...

 

[picasm]

The chip defaults to analogue comparator mode for the ports that support it - RA0,1 have analogue functions but RA6,7 are digital only.
You need to initialize the ports to digital as shown in the data sheet example below to make them work digitally.

EXAMPLE 5-1: Initializing PORTA
CLRF PORTA ;Initialize PORTA by
;setting output data latches
MOVLW 0x07 ;Turn comparators off and
MOVWF CMCON ;enable pins for I/O
;functions
BCF STATUS, RP1
BSF STATUS, RP0;Select Bank1
MOVLW 0x1F ;Value used to initialize
;data direction
MOVWF TRISA ;Set RA<4:0> as inputs
;TRISA<5> always
;read as ‘1’.
;TRISA<7:6>
;depend on oscillator mode

 

[Jekyll]

Thanks! I bet that's it!

Does anyone know how to do this in C code?

 

[Jekyll]

I found that in mikroC the command is:

CMCON = 0x07;

and it fixed the problem!